Design modification in rotor blade of turbo molecular pump

Iqbal, Munawar; Wasy, Abdul; Batani, D.; Rashid, Haris; Lodhi, M. A. K.

doi:10.1016/j.nima.2012.02.030

Cited by 17 publications

(3 citation statements)

References 3 publications

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“…One of the parameters affecting the AMTEC efficiency is the thickness of BASE and electrodes, which we have investigated in this work by computer simulation. With the Nano scale modern technology available [11,12] one can examine experimentally the influence of the variation in thickness of BASE and electrodes at this scale.…”

Section: Working Principle Of Amtecmentioning

confidence: 99%

Optimization of power of alkali metal thermo electric convertor

Lodhi

Ahmad²

2015

Journal of Power Sources

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Section: Working Principle Of Amtecmentioning

confidence: 99%

Optimization of power of alkali metal thermo electric convertor

Lodhi

Ahmad²

2015

Journal of Power Sources

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“…Researchers focus on the generalization and summarization of hydraulic models [9,10], profiles optimization of hydraulic components [11,12], and internal flow fields by CFD (Computational Fluid Dynamics) with respect to optimizing the pump flow path [13][14][15]. Liquid streamlines in pumps are in accordance with the blade profiles, under the constraint of the impeller and stay vane.…”

Section: Introductionmentioning

confidence: 99%

Optimization Study on a Novel High-Speed Oil-Free Centrifugal Water Pump with Hydrodynamic Bearings

et al. 2019

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In aerospace fields and industrial sectors, high-speed centrifugal pumps are prevalent and in increasingly strict demand regarding characteristics such as the long life, small volume, light weight, and low noise. In this study, we present a novel high-speed centrifugal water pump with hydrodynamic bearings used to employ work fluid as lubricant. A three-dimensional numerical study of the turbulent fluid flow was carried out to predict the performance of the pump. The computational model was validated against experimental results during hydraulic tests. Additionally, the effect of the blade number on the head and efficiency of the pump was researched. The blade number of the impeller was changed from 4 to 8 and that of the stay vane was from 3 to 14. The results indicate that the blade number and the matching characteristic of the impeller and the stay vane significantly influenced the performance of the pump. The structure based on the seven-blade impeller and the six-blade stay vane had the highest efficiency (30.8%). Numerical investigations of this study may help reduce the significant cost and time of experimental work for a particular design.

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“…A turbo molecular pump (TMP) is currently one of the most widely used apparatus for obtaining high and ultrahigh vacuum. A number of investigations have been carried out on the pumping principle [1], key structures [2][3][4][5][6] and manufacturing technologies [7] of the pump. Among the studies on effective pumping speed of TMP, especially the pumping mechanism, at the turbine blades region, either with the 2D model [8][9][10] or 3D model [11][12][13][14][15], most of them are based on the hypothesis that the incident gas molecules (IGM) distribute uniformly at the turbine blades surface [8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Monte Carlo simulation of gas free molecular flow in turbo molecular pump’s inlet tube

Sun

Zhang

et al. 2018

Molecular Simulation

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Due to the beaming effect of inlet tube and reflection effect of turbine cover in the turbo molecular pump, the positional and angular distribution of incident gas molecules (IGM) on the turbine blades would no longer be uniformly distributed. Based on the test particle Monte Caro method, a new self-defining procedure is proposed and it can be more accurate to describe the status of IGM into turbine blades. The results show that the influence of rotor speed on the transmission probability is indistinctive. Meanwhile, the incident density between the tip and root of the blades is distinct. The positional beaming effect and the angular beaming effect are enhanced with the lengthening of the tube and less molecule diverge towards the tube wall. The positive transmission probability of first-stage turbine blades using our new method is different from those obeying the cosine distribution under the same number of incident molecules. The calculation results of new method verified by another procedure are reasonable and accurate.

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Design modification in rotor blade of turbo molecular pump

Cited by 17 publications

References 3 publications

Optimization of power of alkali metal thermo electric convertor

Optimization of power of alkali metal thermo electric convertor

Optimization Study on a Novel High-Speed Oil-Free Centrifugal Water Pump with Hydrodynamic Bearings

Monte Carlo simulation of gas free molecular flow in turbo molecular pump’s inlet tube

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